package com.atguigu.gulimall.gulimallproduct.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.gulimallproduct.dao.CategoryDao;
import com.atguigu.gulimall.gulimallproduct.entity.CategoryEntity;
import com.atguigu.gulimall.gulimallproduct.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //组装成父子的树形结构
        List<CategoryEntity> level1Menus=entities.stream().filter(categoryEntity -> categoryEntity.getParentCid()==0)
                .map((menu)->{
                    menu.setChildren(getChildrens(menu,entities));
                    return menu;
                }).sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())- (menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());
        return level1Menus;
    }

    public List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children=all.stream().filter(categoryEntity ->
            categoryEntity.getParentCid().equals(root.getCatId())).map((menu)->{
            menu.setChildren(getChildrens(menu,all));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())- (menu2.getSort()==null?0:menu2.getSort());})
                .collect(Collectors.toList());

        return children;

    }

}